So it’s actually more complicated than that (at least to your first point, the points about drug companies is accurate). First, I support M4A, especially plans like Bernie’s that improved reimbursement. One major issue is that the government (Medicaid in particular, Medicare also) pays below costs in some cases. So hospitals charge a shit ton to commercial insurance to make up for their loss on other patients.
In terms of employers saving money, most large employers have moved to self-insurance (70-80%, depending on how you define “large”).